good idea, and add java-sun for windows in the package. :-)
Personally I use Scite http://www.scintilla.org
but you must read some help and configure manually the options.
For windows user (after installing Lilypond):

Just unzip and run-it;
chose uft-8 code in the file menu,
write your Lilypond scrip,
save-it and touch ctrl+l
Your file.ly, log ps and pdf are in the same folder.
What is it more simple ?
--
Martial
http://cathemline.org